Beryllium oxide generation preventing method for boilers of power plant

Abstract

The invention discloses a beryllium oxide generation preventing method for boilers of a power plane, and the method can effectively avoid dry burning of heated surfaces. The method includes the following steps that firstly, a deaerator is heated, specifically, auxiliary steam is used for heating the deaerator, the heat source can increase the water temperature of the deaerator to 160 DEG C, and the temperature of a start-up separator outlet (or a steam pocket) of the corresponding boiler reaches 75 DEG C or above; secondly, feed water is heated, specifically, feed water heaters for starting of a unit are added through technical transformation or unit high-pressure heaters are directly selected, a steam source is taken from an adjacent unit and connected into the heaters, the feed water temperature is increased to a larger extent, the steam production amount is increased, the temperatures of the heated surfaces are greatly increased, the hearth temperature is increased, and the combustion condition in the ignition preliminary stage of the boilers is greatly improved; and thirdly, water is fed to the boilers till start-up separators encounter water, all drainage and vent valves of the boilers are closed, a steam turbine vacuum pump is started, and high-pressure bypass boilers and low-pressure bypass boilers are started and vacuumized.

Description

technical field [0001] The invention relates to a method for preventing the formation of beryllium oxide for power plant boilers. Background technique [0002] Coal-fired power plant units consume a large amount of fuel each time they are started, roughly 50-100 tons. In order to save start-up costs, most power plants have carried out technological transformation to reduce fuel consumption. The technologies used are mainly divided into two categories: one is plasma ignition, and the other is micro oil gun. After the transformation, the pulverizing system can be started at the initial stage of boiler ignition, and the temperature and pressure of the boiler can be raised by burning coal instead of fuel oil, but the disadvantages of the two are also very obvious. After starting the pulverizing system, the temperature of the boiler rises suddenly, but it takes a process for the water-cooled wall to absorb heat. There is no medium cooling in the main and re-steam systems of the ...

AI Technical Summary

Problems solved by technology

After starting the pulverizing system, the temperature of the boiler rises suddenly, but it takes a process for the water-cooled wall to absorb heat. There is no medium cooling in the main and re-steam systems of the boiler, which leads to dry burning of the superheater and reheater in each section, and the formation of beryllium oxide

When the boiler just produces steam, the steam temperature is low, and the temperature difference between the superheater and the reheater wall is large. The heating surface is suddenly cooled, and the previously formed beryllium oxide falls off directly. Overheating, in severe cases, it will cause the tube to explode

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